Cell detection equipment for retired power battery

Abstract

The utility model discloses a cell detection device of a retired power battery, which can detect a plurality of groups of cells to be detected at the same time by arranging a workbench to carry cells to be detected, arranging a pressure plate to carry an internal resistance testing device, a charging testing device and a discharging testing device, and by means of linkage cooperation between the workbench and the pressure plate. The detection items of the to-be-detected battery cells can be randomly switched, so that the cyclic detection of multiple groups of to-be-detected battery cells can be realized at the same time, the single to-be-detected battery cell of the decommissioned power battery can be subjected to multi-step complete detection, the detection accuracy is ensured, the to-be-detected battery cells of the decommissioned power battery can be detected in groups, and the detection efficiency is improved. And the cell detection efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cell detection, in particular to a battery cell detection device for retired power batteries. Background Art

[0002] With the continuous development and growth of the new energy vehicle market, the cascade utilization and scrapping of retired batteries have also begun to attract industry attention. Effective detection of retired batteries is conducive to the secondary utilization of retired batteries. Conventional detection of retired batteries either directly acts on the battery pack and ignores the health status of the individual cells. If the unqualified cells in the battery pack cannot be eliminated, the secondary utilization of retired batteries will have hidden dangers. Alternatively, the indicators of individual cells are tested one by one, wasting a lot of time and energy.

[0003] The inspection of retired battery cells includes appearance inspection, internal resistance inspection, and constant current and constant voltage charge and discharge tests. Appearance inspection generally uses CCD appearance inspection. When the cell has appearance defects such as deformation, bulging, and leakage, it is preliminarily determined that the cell is unqualified and is discarded. Internal resistance inspection and constant current and constant voltage charge and discharge tests require the cells to be inspected to be connected to the corresponding circuits. If they are inspected one by one, a lot of time and energy will be wasted. Directly connecting the cells in series for inspection will result in a large number of missed detections and false detections, affecting the secondary utilization of retired batteries. Utility Model Content

[0004] In order to solve the technical problems existing in the background technology, the utility model proposes a battery cell detection device for retired power batteries, which can perform cyclic detection on multiple groups of battery cells to be detected at the same time, thereby ensuring the accuracy of the detection and improving the efficiency of the battery cell detection.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A battery cell testing device for retired power batteries comprises: a device body and a workbench, wherein an internal resistance test device, a charging test device and a discharging test device are installed on the device body; and a first driving device is also provided which can drive the workbench to drive a first battery cell to be tested positioned at a first workstation on the workbench to switch between docking with the internal resistance test device, docking with the discharging test device and docking with the charging test device.

[0007] Furthermore, the internal resistance testing device, the discharge testing device, and the charging testing device are all installed on the equipment body through the second driving device. The first driving device can drive the workbench and drive the first workstation to rotate, so that the first battery cell to be tested positioned on the first workstation can be switched between the position below the internal resistance testing device, the position below the discharge testing device, and the position below the charging testing device. The second driving device can drive the internal resistance testing device / discharge testing device / charging testing device to move downward to dock with the first battery cell to be tested on the first workstation located below the internal resistance testing device / discharge testing device / charging testing device.

[0008] Furthermore, the internal resistance test device, the charging test device, and the discharging test device all have a positive plug and a negative plug. The first workstation specifically includes an insulating base installed on the workbench, the base is provided with a positive jack and a negative jack, and the base is provided with a storage slot adapted to the first battery cell to be tested. The slot body is expanded to have a positive conductive slot that can accommodate the positive electrode of the first battery cell to be tested placed in the storage slot, and a negative conductive slot that can accommodate the negative electrode of the first battery cell to be tested. The positive jack is electrically connected to the positive conductive slot, and the negative jack is electrically connected to the negative conductive slot. When the first battery cell to be tested on the first workstation is docked with the internal resistance test device / charging test device / discharging test device, the positive plug is adapted to the positive jack, and the negative plug is adapted to the negative jack.

[0009] Furthermore, the internal resistance test device, the discharge test device, and the charging test device are all installed on a pressure plate, and the pressure plate is driven downward by a second driving device installed on the equipment body so that the positive plug and the negative plug of the internal resistance test device / discharge test device / charging test device slide into the positive jack and the negative jack respectively, and the internal resistance test device / discharge test device / charging test device is connected to the first battery cell to be tested on the first workstation.

[0010] Furthermore, the workbench also has a second workstation for positioning the second battery cell to be tested on the workbench and a third workstation for positioning the third battery cell to be tested on the workbench. When the first battery cell to be tested is located below the internal resistance testing device, the second battery cell to be tested is located below the discharge testing device, and the third battery cell to be tested is located below the charging testing device, so that the second driving device can drive the internal resistance testing device, the discharge testing device, and the charging testing device to move downward together to respectively dock with the first battery cell to be tested, the second battery cell to be tested, and the third battery cell to be tested.

[0011] Furthermore, the first driving device can drive the workbench to rotate until the first battery cell to be tested is located below the discharge test device, the second battery cell to be tested is located below the charging test device, and the third battery cell to be tested is located below the internal resistance test device, so that the second driving device can drive the internal resistance test device, the discharge test device, and the charging test device to move downward together to respectively dock with the third battery cell to be tested, the first battery cell to be tested, and the second battery cell to be tested.

[0012] Furthermore, the charging test device includes a constant voltage and constant current charging circuit, which includes a DC power supply E, a diode D1, a transistor Q1, a transistor Q2, a resistor R2, a resistor R3 and a resistor R4. The positive electrode of the DC power supply E is respectively connected to the collector of the transistor Q1 and one end of the resistor R2, and the other end of the resistor R2 is respectively connected to the negative electrode of the diode D1, the base of the transistor Q1 and the collector of the transistor Q2. The emitter of the transistor Q1 is connected to the positive plug, the base of the transistor Q2 is connected to one end of the resistor R3, the emitter of the transistor Q2 is connected to one end of the resistor R4, the positive electrode of the diode D1 and the negative electrode of the DC power supply E, and the other end of the resistor R3 and the other end of the resistor R4 are both connected to the negative plug.

[0013] Furthermore, a switch K is connected in series between the emitter of the transistor Q1 and the positive plug.

[0014] Furthermore, the constant voltage and constant current charging circuit also includes an overvoltage protection branch formed by a varistor R5 and a lamp bead L2 connected in series, and two ends of the overvoltage protection branch are respectively connected to the positive plug and the negative plug.

[0015] Beneficial effects of the utility model: the battery cell detection equipment for retired power batteries provided in the present application, by arranging a workbench to carry the battery cells to be detected, arranging a pressure plate to carry the internal resistance testing device, the charging testing device and the discharging testing device, and through the linkage cooperation between the workbench and the pressure plate, can detect multiple groups of battery cells to be detected at the same time, and can arbitrarily switch the detection items of the battery cells to be detected, thereby realizing the cyclic detection of multiple groups of battery cells to be detected at the same time, which can not only perform multi-step complete detection on a single battery cell to be detected in the retired power battery to ensure the accuracy of the detection, but also can detect the battery cells to be detected of the retired power batteries in groups, thereby greatly improving the battery cell detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a top view of the workbench of the utility model.

[0017] Figure 2 It is a bottom view of the pressure plate of the utility model.

[0018] Figure 3 The figure is a circuit diagram of the internal resistance testing device of the utility model.

[0019] Figure 4 This is a circuit diagram of the charging test device of the utility model.

[0020] Figure 5 The figure is a circuit diagram of the discharge test device of the utility model. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figure 1-2 As shown, the utility model provides a cell detection device for retired power batteries, including a workbench 10 and a pressure plate 20 arranged above the workbench 10, the workbench 10 and the pressure plate 20 are both installed on the equipment body, the workbench 10 is driven to rotate by a first driving device installed on the equipment body, and the pressure plate 20 is driven to rise and fall by a second driving device installed on the equipment body, the first driving device is driven by a servo motor, the output shaft of the servo motor is connected to the bottom of the workbench 10, the second driving device is a telescopic cylinder, and the lifting and retracting rod of the telescopic cylinder is connected to the top of the pressure plate 20.

[0023] An internal resistance test device, a charging test device and a discharging test device are installed on the pressure plate 20. The internal resistance test device is used to detect the internal resistance of the battery cell to be tested, the charging test device is used to detect the charging time of the battery cell to be tested, and the discharging test device is used to detect the capacity of the battery cell to be tested.

[0024] The workbench 10 is provided with a first station for positioning the first battery cell to be tested on the workbench 10, a second station for positioning the second battery cell to be tested on the workbench 10, and a third station for positioning the third battery cell to be tested on the workbench 10. The first driving device can drive the workbench 10 and drive the first station to rotate, so that the first battery cell to be tested positioned at the first station can be switched between the position below the internal resistance testing device, the position below the discharge testing device, and the position below the charging testing device. The second driving device can drive the internal resistance testing device / discharge testing device / charging testing device to move downward to dock with the first battery cell to be tested at the first station located below the internal resistance testing device / discharge testing device / charging testing device.

[0025] When the first battery cell to be tested is located below the internal resistance testing device, the second battery cell to be tested is located below the discharge testing device, and the third battery cell to be tested is located below the charging testing device, so that the second driving device can drive the internal resistance testing device, the discharge testing device, and the charging testing device to move downward together to respectively dock with the first battery cell to be tested, the second battery cell to be tested, and the third battery cell to be tested.

[0026] When the first driving device drives the workbench 10 to rotate to the position where the first battery cell to be tested is located below the discharge test device, the second battery cell to be tested is located below the charging test device, and the third battery cell to be tested is located below the internal resistance test device, so that the second driving device can drive the internal resistance test device, the discharge test device, and the charging test device to move downward together to respectively dock with the third battery cell to be tested, the first battery cell to be tested, and the second battery cell to be tested.

[0027] When the first driving device drives the workbench 10 to rotate until the first battery cell to be tested is located below the charging test device, the second battery cell to be tested is located below the internal resistance test device, and the third battery cell to be tested is located below the discharge test device, so that the second driving device can drive the internal resistance test device, the discharge test device, and the charging test device to move downward together to respectively dock with the second battery cell to be tested, the third battery cell to be tested, and the first battery cell to be tested.

[0028] Among them, the first station, the second station, and the third station are test stations with exactly the same structure, which are not specific and are distinguished in this application for the convenience of clearly describing the process. Similarly, the first battery cell to be tested, the second battery cell to be tested, and the third battery cell to be tested can also be any battery cell to be tested placed in the test station.

[0029] The internal resistance test device, the charging test device, and the discharging test device are all provided with a positive plug 21 and a negative plug 22. The first workstation specifically includes an insulating base 11 installed on the workbench 10, and the base 11 is provided with a positive electrode jack 12 and a negative electrode jack 13. The base is provided with a storage groove 14 adapted to the first battery cell 1 to be tested. The groove body is expanded to have a positive conductive groove 15 that can accommodate the positive electrode of the first battery cell 1 to be tested placed in the storage groove 14, and a negative conductive groove 16 that can accommodate the negative electrode of the first battery cell 1 to be tested. The positive electrode jack 12 is electrically connected to the positive conductive groove 15, and the negative electrode jack 13 is electrically connected to the negative conductive groove 16.

[0030] When the first driving device drives the first battery cell 1 to be tested on the first station to be located below the internal resistance testing device / charging testing device / discharging testing device, the second driving device drives the pressure plate 20 downward to allow the positive plug 21 and the negative plug 22 of the internal resistance testing device / discharging testing device / charging testing device to slide into the positive pole socket 12 and the negative pole socket 13 respectively. At this time, the positive plug 21 is adapted in the positive pole socket 12, and the negative plug 22 is adapted in the negative pole socket 13, so that the internal resistance testing device / discharging testing device / charging testing device is docked with the first battery cell 1 to be tested on the first station.

[0031] During the actual test, the first battery cell to be tested is first placed in the first station, and the internal resistance test device is used to test the internal resistance of the first battery cell to be tested. Then, the second battery cell to be tested is placed in the second station and the workbench is rotated. The first battery cell to be tested is tested for charging by the charging test device, and the second battery cell to be tested is tested for internal resistance by the internal resistance test device. Then, the third battery cell to be tested is placed in the third station and the workbench is rotated. The discharge test device is used to test the first battery cell to be tested, the charging test device is used to test the second battery cell to be tested, and the internal resistance test device is used to test the third battery cell to be tested. Next, the first battery cell to be tested that has completed all the tests is taken out and the fourth battery cell to be tested is placed in the third station and the workbench is rotated. The test cell is placed in the first station and the workbench is rotated, the second cell to be tested is subjected to discharge test, the third cell to be tested is subjected to charge test, the fourth cell to be tested is subjected to internal resistance test, and so on, until all the cells to be tested are tested, so that three cells to be tested can be tested in a cycle at the same time, and more test stations and three test devices can be installed on the workbench and the pressure plate respectively to realize the simultaneous cycle test of more cells to be tested, which not only realizes the multi-step complete test of a single cell to be tested in the retired power battery to ensure the accuracy of the test, but also can test the cells to be tested of the retired power battery in groups, greatly improving the cell detection efficiency.

[0032] like Figure 3 As shown, the internal resistance test device adopts a dual resistance method detection circuit, wherein the dual resistance method detection circuit includes a resistor R1 and a voltage sensor V for measuring the voltage across the resistor R1, the two ends of the resistor R1 are respectively connected to the corresponding positive plug and negative plug, and the internal resistance r of the corresponding battery cell 1 is measured, r = (e / v-1) r1, wherein r1 is the resistance value of the resistor R1, e is the rated voltage (electromotive force) of the battery cell 1, and v is the voltage across the resistor R1. If the internal resistance value of the battery cell is detected to be higher than 2 / 3 of the factory battery cell resistance value, it is marked as unqualified and disassembled and crushed for recycling.

[0033] like Figure 4As shown, the charging test device adopts a constant voltage and constant current charging circuit, which includes a DC power supply E, a diode D1, a transistor Q1, a transistor Q2, a resistor R2, a resistor R3 and a resistor R4. The positive electrode of the DC power supply E is respectively connected to the collector of the transistor Q1 and one end of the resistor R2, the other end of the resistor R2 is respectively connected to the negative electrode of the diode D1, the base of the transistor Q1 and the collector of the transistor Q2, the emitter of the transistor Q1 is connected to the corresponding positive plug, the base of the transistor Q2 is connected to one end of the resistor R3, the emitter of the transistor Q2 is connected to one end of the resistor R4, the positive electrode of the diode D1 and the negative electrode of the DC power supply E, and the other end of the resistor R3 and the other end of the resistor R4 are both connected to the corresponding negative plug.

[0034] Among them, the diode D1, the resistor R2 and the transistor Q1 are connected to form a voltage stabilizing module, and the resistor R3, the resistor R4 and the transistor Q2 are connected to form a constant current module. The voltage stabilizing module is used to provide a stable voltage, and the constant current module detects the current and maintains a constant current.

[0035] Specifically, the DC power supply E provides a regulated current to the diode D1 through the resistor R2, so that the base of the transistor Q1 obtains a stable voltage, and the emitter output of the transistor Q1 is connected to the positive electrode of the battery cell 1 to be detected, forming an emitter follower, and the emitter of the transistor Q1 outputs a stable voltage; when the voltage across the battery cell 1 to be detected is relatively low, the charging current is relatively large and it is easy to damage the battery cell. At this time, the current flows through the resistor R4. When the current is large enough to reach the set value, the voltage across R4 rises, and the transistor Q2 is turned on to lower the voltage of the base of the transistor Q1. The voltage of the emitter of the transistor Q1 also decreases accordingly, and the current also decreases accordingly, so as to always remain within the set current range; when the voltage across the battery cell 1 to be detected rises to the output voltage, the current decreases, and the voltage across the resistor R4 cannot turn on the transistor Q2, the constant current module no longer works, and only a constant voltage is output, which complies with the constant current and constant voltage charging method. In this circuit, resistor R3 protects the BE junction of transistor Q2 to prevent excessive BE current from damaging transistor Q2.

[0036] A switch K is connected in series between the emitter of the transistor Q1 and the positive plug. When the switch K is closed, the charging start time of the battery to be tested is recorded. The constant voltage and constant current charging circuit also includes an overvoltage protection branch formed by a varistor R5 and a lamp bead L2 connected in series. The two ends of the overvoltage protection branch are respectively connected to the corresponding positive plug and negative plug. According to the characteristics of the varistor, when the voltage across the varistor is lower than the rated voltage value, the resistance of the varistor is close to infinity, and almost no current passes through the inside. When the voltage across the varistor exceeds the rated voltage but does not exceed the maximum limit voltage, the varistor will quickly break down and turn on, changing from a high-resistance state to a low-resistance state, and the working current also increases sharply. In this application, a varistor R5 with the same rated voltage as the rated voltage of the battery to be tested is selected. Since the overvoltage protection branch is connected in parallel at both ends of the battery to be tested, when the battery to be tested reaches the rated voltage of the full charge, the varistor R5 is turned on, and the lamp bead L2 is powered on and lights up, indicating that the charging is completed, and the charging completion time of the battery to be tested is recorded.

[0037] like Figure 5 As shown, the discharge test device adopts a rated power consumption discharge circuit, which includes an appliance P with rated power consumption and a lamp bead L1. The appliance P and the lamp bead L1 are connected in series between the corresponding positive plug and negative plug. When the battery cell to be tested is connected to the discharge test device, the lamp bead L1 lights up and records the discharge start time of the battery cell to be tested. When the battery cell to be tested is exhausted, the lamp bead L1 goes out and records the discharge end time of the battery cell to be tested. The capacity of the battery cell to be tested C = pt / u, where p is the rated power consumption of the appliance P, u is the rated voltage of the appliance P, and t is the discharge time of the battery cell to be tested. If the capacity of the battery cell is detected to be less than 20% compared with the initial capacity, it is marked as unqualified and disassembled and crushed for recycling.

[0038] The above contents are merely examples and explanations of the structure of the utility model. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the utility model.

Claims

1. A cell testing device for retired power batteries, characterized in that: include: The device body and the workbench (10) are provided with an internal resistance test device, a charging test device, and a discharging test device installed on the device body; and the device body also includes a first driving device capable of driving the workbench (10) to drive a first battery cell (1) to be tested, which is positioned at a first workstation on the workbench (10), to switch between docking with the internal resistance test device, docking with the discharging test device, and docking with the charging test device.

2. The detection device according to claim 1, characterized in that: The internal resistance test device, the discharge test device, and the charging test device are all installed on the equipment body through a second drive device. The first drive device can drive the workbench (10) and drive the first station to rotate, so that the first battery cell (1) to be tested located on the first station can be switched between the position below the internal resistance test device, the position below the discharge test device, and the position below the charging test device. The second drive device can drive the internal resistance test device / discharge test device / charging test device to move downward to dock with the first battery cell (1) to be tested located on the first station below the internal resistance test device / discharge test device / charging test device.

3. The detection device according to claim 2, characterized in that: The internal resistance test device, the charging test device, and the discharging test device all have a positive plug (21) and a negative plug (22); the first workstation specifically comprises an insulating base (11) mounted on a workbench (10); the base (11) is provided with a positive plug hole (12) and a negative plug hole (13); the base is provided with a storage groove (14) adapted to a first battery cell (1) to be tested; a positive conductive electrode that can accommodate the positive electrode of the first battery cell (1) to be tested placed in the storage groove (14) is expanded in the groove body; A slot (15) and a negative electrode conductive slot (16) capable of accommodating the negative electrode of the first battery cell to be tested (1), the positive electrode socket (12) is electrically connected to the positive electrode conductive slot (15), and the negative electrode socket (13) is electrically connected to the negative electrode conductive slot (16). When the first battery cell to be tested (1) on the first station is docked with the internal resistance test device / charging test device / discharging test device, the positive electrode plug (21) is adapted to the positive electrode socket (12), and the negative electrode plug (22) is adapted to the negative electrode socket (13).

4. The detection device according to claim 3, characterized in that: The internal resistance test device, the discharge test device, and the charging test device are all mounted on a pressure plate (20), and the pressure plate (20) is driven downward by a second drive device mounted on the device body so that the positive plug (21) and the negative plug (22) of the internal resistance test device / discharge test device / charging test device slide into the positive plug hole (12) and the negative plug hole (13) respectively, and the internal resistance test device / discharge test device / charging test device is docked with the first battery cell (1) to be tested on the first station.

5. The detection device according to claim 2, characterized in that: The workbench (10) also has a second workstation for positioning a second battery cell to be detected on the workbench (10) and a third workstation for positioning a third battery cell to be detected on the workbench (10); when the first battery cell to be detected is located below the internal resistance test device, the second battery cell to be detected is located below the discharge test device, and the third battery cell to be detected is located below the charge test device, so that the second drive device can drive the internal resistance test device, the discharge test device, and the charge test device to move downward together to respectively dock with the first battery cell to be detected, the second battery cell to be detected, and the third battery cell to be detected.

6. The detection device according to claim 5, characterized in that: The first driving device can drive the workbench (10) to rotate until the first battery cell to be tested is located below the discharge test device, the second battery cell to be tested is located below the charge test device, and the third battery cell to be tested is located below the internal resistance test device, so that the second driving device can drive the internal resistance test device, the discharge test device, and the charge test device to move downward together to respectively dock with the third battery cell to be tested, the first battery cell to be tested, and the second battery cell to be tested.

7. The detection device according to claim 3, characterized in that: The charging test device includes a constant voltage and constant current charging circuit, which includes a DC power supply E, a diode D1, a transistor Q1, a transistor Q2, a resistor R2, a resistor R3 and a resistor R4. The positive electrode of the DC power supply E is respectively connected to the collector of the transistor Q1 and one end of the resistor R2, the other end of the resistor R2 is respectively connected to the negative electrode of the diode D1, the base of the transistor Q1 and the collector of the transistor Q2, the emitter of the transistor Q1 is connected to the positive plug, the base of the transistor Q2 is connected to one end of the resistor R3, the emitter of the transistor Q2 is connected to one end of the resistor R4, the positive electrode of the diode D1 and the negative electrode of the DC power supply E, and the other end of the resistor R3 and the other end of the resistor R4 are both connected to the negative plug.

8. The detection device according to claim 7, characterized in that: A switch K is connected in series between the emitter of the transistor Q1 and the positive plug.

9. The detection device according to claim 8, characterized in that: The constant voltage and constant current charging circuit also includes an overvoltage protection branch formed by a varistor R5 and a lamp bead L2 connected in series, and two ends of the overvoltage protection branch are respectively connected to the positive plug and the negative plug.

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